Global Patent Index - EP 1211228 A4

EP 1211228 A4 20050601 - OPTICAL FIBER DRAWING METHOD AND DRAWING DEVICE

Title (en)

OPTICAL FIBER DRAWING METHOD AND DRAWING DEVICE

Title (de)

VERFAHREN ZUM ZIEHEN VON OPTISCHEN FASERN UND VORRICHTUNG ZUM ZIEHEN

Title (fr)

PROCEDE ET DISPOSITIF D'ETIRAGE DE FIBRES OPTIQUES

Publication

EP 1211228 A4 20050601 (EN)

Application

EP 00942422 A 20000630

Priority

  • JP 0004353 W 20000630
  • JP 19034399 A 19990705

Abstract (en)

[origin: EP1211228A1] A drawing apparatus 1 has a drawing furnace 11 for heating and drawing an optical fiber preform 2, and a carbon heater 13 is disposed in this drawing furnace 11. The carbon heater 13 has a heating portion the length of which in a drawing direction is set to not less than 280 mm. The carbon heater 13 heats the preform so that a maximum temperature on the surface of the optical fiber preform 2 in the drawing furnace 11 becomes below 1800 DEG C. The optical fiber preform 2 is drawn in a state in which the temperature of the muffle tube 12 of the drawing furnace 11 is kept below 1800 DEG C, so that atomic arrangement in the optical fiber preform 2 becomes relatively aligned in a state of reduced randomness of atomic arrangement. This permits the optical fiber 3 to be drawn as reflecting the reduced randomness state of atomic arrangement, whereby the optical fiber 3 can be obtained with reduced Rayleigh scattering intensity and lowered transmission loss. <IMAGE>

IPC 1-7

C03B 37/027; C03B 37/029

IPC 8 full level

C03B 37/027 (2006.01); C03B 37/029 (2006.01); G02B 6/00 (2006.01)

CPC (source: EP KR US)

C03B 37/027 (2013.01 - EP KR US); C03B 37/02772 (2013.01 - EP US); C03B 37/029 (2013.01 - EP US); C03B 2205/45 (2013.01 - EP US); C03B 2205/47 (2013.01 - EP US); C03B 2205/63 (2013.01 - EP US); C03B 2205/72 (2013.01 - EP US)

Citation (search report)

  • [X] US 4557742 A 19851210 - THIGPEN LAWRENCE E [US]
  • [X] US 5242476 A 19930907 - BARTEL ULRICH [DE], et al
  • [X] PATENT ABSTRACTS OF JAPAN vol. 014, no. 131 (C - 0700) 13 March 1990 (1990-03-13)
  • [X] PATENT ABSTRACTS OF JAPAN vol. 004, no. 016 (C - 072) 7 February 1980 (1980-02-07)
  • [X] PATENT ABSTRACTS OF JAPAN vol. 1995, no. 11 26 December 1995 (1995-12-26)
  • [X] PATENT ABSTRACTS OF JAPAN vol. 017, no. 037 (C - 1019) 25 January 1993 (1993-01-25)
  • See references of WO 0102312A1

Designated contracting state (EPC)

GB SE

DOCDB simple family (publication)

EP 1211228 A1 20020605; EP 1211228 A4 20050601; AU 5707500 A 20010122; AU 772566 B2 20040429; CN 1204072 C 20050601; CN 1367763 A 20020904; JP 2001019464 A 20010123; KR 20020029416 A 20020418; US 2002078715 A1 20020627; WO 0102312 A1 20010111

DOCDB simple family (application)

EP 00942422 A 20000630; AU 5707500 A 20000630; CN 00811172 A 20000630; JP 0004353 W 20000630; JP 19034399 A 19990705; KR 20027000085 A 20020104; US 3533002 A 20020104